Motor base



Sept. 20, 1932. c A s 1,878,983 I MOTOR BASE Filed Sept. 9. 1930 2 Sheets-Sheek l I y' I INVENTOR BY Z C. HARRIS Sept. 20, 1932.

'MOTOR BASE Filed Sept. 9, 1930 2 Sheets-Sheet 2 INVENTOR N WATTORNEYQ' area of contact, affords a greater and more;

Patented Sept. 20, 1932 UNITED STATES PATENT] o ncE' CLEO HARRIS, OF CINCINNATI, OHIO, ASS

IGNOR TO CINCINNATI BALI: CRANK COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO moron BASE Application filed September 9, 1930. Serial No. 480,756.

support. To put the proper tension on the belt for a positive drlve and non-slippage over the pulleys, it is necessary that considerable tensioning force or thrust be exerted on the belt. For the purpose of tensioning the belt the'motor base is slidably mounted on the frame for movement toward and from the driven pulley and in this instance preferably on rails as a of the machine to which the motive power is applied. I

It is an object of this invention to provideelongated one-piece bearings at right angles to the axis of the a motor base having motor shaft, these hearings reventing binding because of twisting oi the base on its slidebearings under the tension thrust imparted from the base to'the belt by way of the pulley of the motor. The use of long onepiece or continuous bearings, presenting fewer binding edges and providing greater uniform distribution of the lateral or twisting thrusts to the slide bearings rods or rails.

Another object is to provide that the base is sectional and that the sections are adjustable relative to the bearings to accommodate for variation in motor size or location of bolt It is another object of this invention to provide a slightl spring tension to t e the same underv for tightening the belt, the tension being applied slightlytoward the pulley end of the motor whereby the tendency for the motor base to rock on its bearings is greatly lessened as the belt is drawn tautl between its pulleys. The effect of this 0 -set application of spring tension is to bala motor basefor urging motor or'driving applied at that side of thefabricated part of the frame .tion or'inaccuracy off-set application ofspring tension along its rails the rails being co the forces apliedto the base, namely, the tension in the elt applied to the pulley of the motor and the means for applyin the tension throu h the base to the pulley. g

Another object relates to the general construction of the motor base and its mounting wherein the same is exceedingly simple and wherein the device for compressing or releasing the spring for adjusting the tension on the belt is easily operable.

Further objects and advantages will be morefully apparent froma description of the accompanying drawings, in which:

lgure 1 is a side view of the motor base I showing it mounted on the frame of an aircompressor and illustrating the motor in position thereon with the belt drawn taut by means of the adjustable yieldable device.

Figure 2 is a base showing a fragmentary portion of the frame of'the machine and illustrating the motor base with the motor removed.

Figure 3 is a sectional view taken on line top plan view of the motor 7 33, Figure 2, illustrating the mounting of a cross member of the base and the association of the belt tensioning device with a particular member.

Figure 4 is a longitudinal sectional view taken "on line 4.4, Figure 2, detailing the adjusting means for the belt tensioning device.

' The motor indicated at 5 has the bolt holes, for attaching the same to the base, drilled in its feet in the conventional manner. It frequently occurs that in the spacing of the bolt holes. The motor base 6 is designed for-adjustment to accommodate for variation in the spacing of the bolt holes as well as being designed for vuse with various size motors. The motor base consistsof a pair-of parallel cross members 7'7 including bolt holes"? and having their adjacent ends joined by bearin sleeves 8-8 and adjustably attached to thegarin sleeves. or base assem 1y is mounted on rods or support rods or rails 9.9, one for each sleeve, a fixed part of the frame 10 of the machine. v

The belt tensioning device, including ad- This motor support justment means,

engaging the member of the frame.

More specifically described, the cross mem-- bers 7-7 are formed of strap iron, each having its respective ends bent into the form of a. tube as at 7 These bearing ends of the cross members are adjustably slidably mounted upon the respective sleeves. Normally, the cross members and the bearing sleeves are a rigid unitary structure, the

. members being secured by means of set screws 15 in each formed end engaging the sleeves. When it is necessary to change the spaced relation of thecross members for accommodating a particular motor bolt hole spacing, the set screws are loosened permitting a justment of the cross members on the bearsleeves. ach member 7 is provided with a pair of longitudinally disposed slots or elongated on its extended end.

bolt holes 7 for the motor attachment bolts 16, the slots permitting crosswise or lateral adjustment of thelmotor on the base.

The'rails or mounting elements for the respective bearing sleeves aresecured in blocks 17 mounted on the frame 10 of the machine to which the motor is delivering motive power. These support blocks are secured to the frame by means of bolts 18, the bolts disposed vertically and passing through tangential slots 19 in the respective ends of the slide rods for the purpose of preventing rotative or longitudinal displacement of these rods.

The cross member disposed toward the outer end of the machine has a bracket 20 secured to its underside, this bracket including a square bore 21 extending parallel with the support rods. The adjustment rod 11 includes a square portion 22 and a round screw-threaded portion 23. The square" portion is disposed through the square bore. of the bracket and includes a head 24 at its inner end.

The coil spring 12 is disposed under compression between the head and the inner face of the bearing bracket. The screw-threaded end of the screw rod passes loosely through the journal block or member 13 of the frame, which has a. downwardly extending screwthreaded stud passing through the frame maintained in position by means of a nut 25 v The end of the rod extending beyond the journal block carries the knurled nut 14 thereon, the nut engaging the outer face of the journal block for adjusting the belt tension device by compressing or loosening the spring as the occasion may demand. i

The motor being rigidly bolted to the slidable or floating base and the belt 26 extended between the pulley 27 of the motor and the driving wheel or pulley 28 of the machine which is being driven, the result of theengagement of the spring under tension against the element of the motor base is to place the belt under tension between the respective driving and driven pulleys. This tension may be accurately governed by rotating the adjustment nut. 5 i

The adjustment screw rod extends parallel to the support rods or rails and is disposed slightly toward the pulley end of the motor for counteracting the force exerted from the belt through the motor pulley tending to rock the motor base or twist the same on its sleeve bearing, and thereby lessening the tendency for the motor base to bind on its support rods.

The bearing sleeves each have continuous or uninterrupted contact with their support rails. The only bearing edges presented are at the respective ends of the sleeves. These one-piece extremely long bearings, due to greater area ofcontact, provide greater and more uniform distribution of twisting thrusts against the support rails and eliminate any possibility of frictional bind between bearings and support rods.

Having described my invention, I claim: 1. In a device of the class described fgrj tensioning a belt between a driven pulley and the driving pulley of ?a motor, a motor base including cross members and bearing sleeves of elongated form oining the adjacent ends of said crossmembers, a frame including a support rod for each bearing sleeve, and means engaging said base for urging along the rods to draw the belt tautlybetween the pulleys.

the same 2. In a device of the class described for tensioning a belt between a driven pulley and the driving pulley of a motor, a motor base including cross members and bearing sleeves of elongated form joining the adjacent ends of said cross members, a frame including a slide rod for each bearing sleeve, a device yieldingly engaging said base for'urging the same along the rails to draw the belt tautlybetween the pulleys,and means for adjusting the device to variably tension the belt;

3. A motor base including the driving pul-; ley of the motor, a'd'riven pulley and a belt between the respective pulleys, comprising, an attaching plate, elongated bearing sleeves at respective ends of the plate, a frame prothe ase plate, and a nut engaging the end of the rod extended throu h the frame and abutting the member of t e frame for adjusting the compression of the spring and placing a yielding force on the motor base for drawing the belt taut between the respective pulleys.

4. An adjustable motor base, comprisin a pair of cross members including formed tu at each end thereof, bearing sleeves slidabliv disposed through the tubular portions of a j acent ends of the cross members, means for adjustably securing the cross members on the sleeves, a frame including support rails for the respective sleeves, and means for adjustinglsthe position of the motor base on the m1 5. An adjustable motor base for tensioning a belt between a motor pulley and a driven pulley, comprising, cross meinbers, bearing sleeves of elongated form joining the respective adjacent ends of the cross members, a

' my name.

frame having su port rods extending throu h the respective caring sleeves for slidab y supporting the base, means for mounting the motor upon said cross members with the axis of its shaft at right angles to the bearing sleeves, and a device engaging the motor base off-center toward the pulley end thereof for slidably adjusting the motor base on the su 1polrt rods forappropriately tensioning t e In witness whereof, I hereunto subscribe CLEO minus. 

